What does it mean to be a maintenance worker recruited by Sichuan Airlines?

Belonging to the maintenance department, it is a type of work with a labor contract, not a professional technician, not a regular worker, and there is a big gap between wage and welfare insurance and regular workers. To put it bluntly, the salary is very low and the welfare is average, but the airline's policy is different. Some companies allow internal logistics workers to test their qualifications as machine workers. Can consult, welcome to ask.